Explain it to me quickly: why are runners and riders freaking out about a feud between Strava and Garmin?

Strava, the Instagram for exercise, is suing Garmin for allegedly copying its features. Josh Taylor explains it to Miles Herbert

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Josh, there's a lot of commentary online from runners and cyclists over Strava suing Garmin. I am a runner, but I must confess I run to get away from the world - not participate in more online discourse. What's it all about?

Miles, Strava is the go-to app for runners and cyclists to track their exercise. It has a lot of social features that allow users to race against the times of other users in a sort of social competition, and find popular places to exercise.